【作者】 翟长海； 李爽； 孙扬； 谢礼立；

【Author】 Zhai Changhai~1,Li Shuang~1,Sun Yang~1 and Xie Lili~(1,2) (1.School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China; 2.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)

【机构】 哈尔滨工业大学土木工程学院； 中国地震局工程力学研究所；

【摘要】 汶川8级地震震害调查发现,这次地震中现浇钢筋混凝土框架结构多发生"强梁弱柱"型破坏,这与规范中"强柱弱梁"抗震设计原则相悖。为探究其原因,采用ABAQUS软件对钢筋混凝土带楼板框架和空框架结构进行了侧向加载情况的性能分析。通过对比纵向梁端钢筋应力变化和柱端钢筋应力变化,以及分析不同侧向位移对应的楼板钢筋的应力变化情况,指出楼板对梁端抗负弯矩能力的增强有很大贡献。研究了节点类型、楼板钢筋材性、侧向位移、梁高、梁跨和板厚等因素对纵向梁端处楼板有效宽度的影响规律,提出了负弯矩作用下梁端处楼板有效宽度的取值方法。更多还原

【Abstract】 In the 5.12 Wenchuan earthquake,one of the major failure modes of frame structures is the strong beam-weak column mode,which illustrates that the strong column-weak beam mode suggested by the Chinese seismic code fails to implemented.The performances of reinforced concrete(RC) frame structures with slab and without slab are analyzed using ABAQUS software.By comparing changes of stress at ends of beam and column and analyzing the change of stress of reinforcements in the slab,it concludes that the slab improves the flexural capacity of sections at the end of beam where under negative moments.Several influence factors of effective width of the slab corresponding to the end of beam,including the joint type,reinforcement material property,lateral deformation,height of beam,size of bay and thick of slab,are investigated.Then,a method to determine the effective width of the slab corresponding to the end of beam is presented.更多还原